# Suppose a laboratory has a 31 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half lives of polonium occur in 966 days? How much polonium is in the sample 966 days later?

##### 1 Answer

May 19, 2017

#### Explanation:

The number of half-lives is simply the number of days given (

The amount of

where

Plugging in known variables, we have